Remove Kafka Connect info from Kubernetes docs

[JakeSCahill]

Description

Resolves https://redpandadata.atlassian.net/browse/DOC-1462
Review deadline: July 22

This pull request introduces updates to the documentation for deploying, managing, and monitoring Kafka Connect and Redpanda in Kubernetes. The changes include reorganization and clarification of Helm chart details, updates to connector management workflows, and improvements to monitoring instructions. Below are the key changes grouped by theme:

Deployment and Helm Chart Updates:

• Updated the Redpanda Helm chart to version 25.1.1 (GA), removing references to the beta version and clarifying that Kafka Connect is no longer bundled as a subchart. Users are now directed to install the connectors Helm chart separately. [1] [2] [3]
• Added instructions for unified installation of the Redpanda Operator and CRDs using a single Helm command.

Kafka Connect Management Enhancements:

• Expanded documentation on verifying Kafka Connect accessibility, including commands to check pod status, test the REST API, and list available connector plugins.
• Introduced a detailed guide for managing connectors through Redpanda Console, including troubleshooting connectivity and using the REST API for automation.

Monitoring Improvements:

• Updated the monitoring prerequisites to include Kafka Connect deployment with monitoring enabled and clarified the required tools (kubectl and Helm).
• Fixed the :env-kubernetes: metadata in the monitoring connectors page to ensure proper rendering for Kubernetes-specific content.

Miscellaneous Updates:

• Corrected a typo in an example configuration field from liables to pandas and updated error messaging for invalid fields.
• Removed unused :page-context-links: metadata from multiple files for consistency. [1] [2]

These changes improve the clarity and usability of the documentation for users managing Kafka Connect and Redpanda in Kubernetes environments.

Page previews

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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[chrisseto]

Unrelated to this PR, I wonder if we should include instructions on how to get started with RPCN when we send out the connectors TSB. WDYT @david-yu ?

PR LGTM!

[micheleRP]

pls check my comments but looks good!

[chrisseto]

LGTM!!